GIVING BRAINLIST One of the Maya civilization's greatest accomplishments was:
O A. getting rid of the social classes that divide people.
O B. uniting Mesoamerica in one powerful empire.
O C. allowing people to vote for their leaders.
D. using the stars to plan for future events.

I think the answer is A..

D. using the stars to plan for future events.

Explanation:

the answer is b your welcome : )

the treaty of brest-litovsk was a peace treaty signed on 3 march 1918 between the new bolshevik government of russia and the central powers (german empire, austria-hungary, bulgaria, and the ottoman empire), that ended russia's participation in world war i.